MoreThanOneOkHttpClientDetector-4.kt

private const val OKHTTP_CLIENT = "okhttp3.OkHttpClient"

private val okHttpClientConstructors = mutableSetOf<CallContextLocation>()

data class CallContextLocation(val context: JavaContext, val location: Location)

override fun getApplicableUastTypes(): List<Class<out UElement>>? {
    return listOf(UCallExpression::class.java)
}

override fun createUastHandler(context: JavaContext): UElementHandler? {
    return OkHttpClientHandler(context)
}

inner class OkHttpClientHandler(private val context: JavaContext) : UElementHandler() {

    override fun visitCallExpression(node: UCallExpression) {
        if(node.getExpressionType()?.canonicalText == OKHTTP_CLIENT && node.kind == UastCallKind.CONSTRUCTOR_CALL) {
            okHttpClientConstructors.add(CallContextLocation(context, context.getLocation(node)))
        }
    }

}

override fun afterCheckRootProject(context: Context) {
    if(okHttpClientConstructors.size > 1) {
        for(callContextLocation in okHttpClientConstructors) {
            reportUsage(callContextLocation.context, callContextLocation.location)
        }
    }
}